1N4890A

Overview

The 1N4890A is a Zener diode manufactured by Microsemi Corporation, designed for voltage regulation applications. It features a nominal Zener voltage of 6.35V with a tolerance of ±5%. The device has a maximum power dissipation of 0.4W and utilizes a silicon junction. It is housed in a DO-7 (DO-204AA) axial leaded package, which is hermetically sealed in glass construction. The component operates within a temperature range suitable for general electronic circuits.

Feature Summary

• Hermetically sealed glass construction for environmental protection
• Axial leaded package for through-hole mounting
• Silicon Zener junction for voltage regulation

Applications

• Voltage reference circuits
• Overvoltage protection
• General purpose rectification and regulation

Procurement Notes

Verify the specific revision suffix to ensure compatibility with required military or commercial standards. Confirm RoHS compliance status as older Microsemi variants may not meet current environmental directives. Check datasheet for exact thermal resistance values if operating near maximum power limits. Ensure the supplier provides traceability documentation for critical applications.

Selection Notes

Select this component when a stable 6.35V reference is needed in a small axial package. Consider the 0.4W power rating against expected load currents to avoid overheating. The DO-7 package offers robust mechanical stability for through-hole PCBs. Compare leakage current specifications if low standby power is critical for the design.

Part Context

This part belongs to the standard Zener diode family produced by Microsemi. It shares the DO-7 package form factor with other low-power regulators in the series. The manufacturer provides both commercial and high-reliability versions of similar part numbers. Designers often use this series for basic voltage clamping tasks in industrial equipment.

Replacement Considerations

Equivalent parts include the 1N4890 from other manufacturers offering identical electrical characteristics. Verify pinout compatibility before substitution. Ensure replacement devices meet the same hermetic sealing requirements if used in harsh environments.